Synology 5 bay NAS DiskStation DS1515+ (Diskless) Compatibility:Windows 7 or above,Mac OS X 10.10 or above Four Gigabit LAN Ports with Failover and Link Aggregation Support Scale up to 15 drives with Synology DX513, Expandable RAM Module (Up to 6GB) Running on Synology Disk Station Manager (DSM) VMware , Citrix , Microsoft Hyper-V Certified,High Availability and SSD Read/Write Cache Support